Looking for a good Head Unit

Hi all,

I am about to purchase a used 2003 Nissan 350z and my first order of business when I get it will be to get a good head unit. I need one that meets a few qualifications and that is where I am hoping someone here could help me out. Here is what I am looking for:

- a 7" head unit (I belive that is how big the one on the 350z is, correct me if I am wrong).

- an exterior auxilary jack (most important thing)

- preferably not touch screen, but can be if it is the better deal.

- AM/FM reciever, CD player and possibly DVD player.

- Not more than $300.

If someone could help me out with this I would greatly appreciate it. The reason I want a 7" head unit is so the car will look as close to stock as possible and there won't be a lot of extra space under the head unit. Thanks again for all the help!